WO2008125505A1 - Arrangement for shielding - Google Patents

Arrangement for shielding Download PDF

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Publication number
WO2008125505A1
WO2008125505A1 PCT/EP2008/053988 EP2008053988W WO2008125505A1 WO 2008125505 A1 WO2008125505 A1 WO 2008125505A1 EP 2008053988 W EP2008053988 W EP 2008053988W WO 2008125505 A1 WO2008125505 A1 WO 2008125505A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
arrangement according
stray field
frequency
dimensioned
Prior art date
Application number
PCT/EP2008/053988
Other languages
German (de)
French (fr)
Inventor
Matthias Drobnitzky
Ludwig Eberler
Wolfgang Renz
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2008125505A1 publication Critical patent/WO2008125505A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/42—Screening
    • G01R33/422—Screening of the radio frequency field
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room

Definitions

  • the invention relates to an arrangement for shielding according to the preamble of claim 1.
  • Magnetic resonance examination devices are usually arranged in so-called "high-frequency screen cabins" whose walls are usually equipped with metal or metal foils. These reflect high-frequency stray fields occurring during the examination, so that a field strength reduction is achieved outside the screen cabin.
  • Magnetic resonance device that emits a high-frequency stray field during operation, arranged in a spatial area.
  • Spatial region has an arrangement which is designed to absorb the high-frequency stray field.
  • FIG. 2 shows an exemplary second embodiment of the present invention.
  • FIG. 1 shows an exemplary first embodiment of the present invention.
  • a magnetic resonance device MRG which emits a high-frequency stray field SF during operation, is arranged in a spatial region RB.
  • the spatial area RB is an examination room or a screen cabin of the type described above.
  • the spatial area RB has an arrangement KS or K, which is designed to absorb the high-frequency stray field SF.
  • the absorbent assembly K or KS comprises, for example, an electrically conductive, low-reflection, damping material, which preferably contains carbon.
  • a mat-shaped configured absorbent material KS is used for absorption of the stray field SF to the bottom or to the ceiling.
  • the absorbent material for example, is additionally shaped conically or pyramidally or in a comparable manner and arranged on the walls - here referred to as a molded material KS.
  • KS truncated cone, truncated pyramid, cylindrical, spherical or respective mixed forms thereof.
  • the conical shape, pyramid shape, etc. is dimensioned such that due to the geometry of an absorption of the stray field.
  • the dimensioning is done, for example, matched to the operating frequency of the magnetic resonance device, which typically forms the stray field via the body coil antenna arrangement.
  • the cone structure or the mat structure is dimensioned for additional absorption of sound waves.
  • the absorbent material at least partially covers the spatial area, preferably the entire space is provided with the absorbent material in a planar manner.
  • 2 shows an exemplary second embodiment of the present invention.
  • An absorbing arrangement KA here comprises frequency-selective resonant circuits RK, which are dimensioned to absorb the high-frequency stray field SF.
  • RK frequency-selective resonant circuits
  • the above-described absorbent material KS can additionally be used.
  • the frequency-selective resonant circuits RK are configured, for example, similar to RFID components that are used in the

Abstract

The invention relates to an arrangement for shielding, wherein a magnetic resonance device, which emits a high frequency stray field during operation, is arranged in a spatial area. The spatial area comprises an arrangement which is designed to absorb the high frequency stray field.

Description

Beschreibungdescription
Anordnung zur AbschirmungArrangement for shielding
Die Erfindung betrifft eine Anordnung zur Abschirmung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an arrangement for shielding according to the preamble of claim 1.
Magnetresonanzuntersuchungsgeräte sind üblicherweise in so genannten "Hochfrequenz-Schirmkabinen" angeordnet, deren Wän- de üblicherweise mit Metall bzw. Metallfolien ausgestattet sind. Diese reflektieren während der Untersuchung auftretende hochfrequente Streufelder, so dass außerhalb der Schirmkabine eine Feldstärke-Reduzierung erreicht wird.Magnetic resonance examination devices are usually arranged in so-called "high-frequency screen cabins" whose walls are usually equipped with metal or metal foils. These reflect high-frequency stray fields occurring during the examination, so that a field strength reduction is achieved outside the screen cabin.
Hält sich während der Untersuchung medizinisches Personal innerhalb der Schirmkabine auf, sind das Personal und gegebenenfalls dort ebenfalls benötigtes weiteres medizinisches Gerät, wie beispielsweise Beatmungsgeräte oder Patientenüberwachungsgeräte, der Wirkung des Streufelds ausgesetzt.If medical personnel reside within the screen cabin during the examination, the personnel and possibly also other medical equipment required there, such as respirators or patient monitoring devices, are exposed to the effect of the stray field.
Insbesondere bei Magnetresonanzgeräten, die zur Untersuchung hohe Magnetfeldstärken verwenden, könnte die Streufeldwirkung zu Fehlfunktionen der Geräte und zur erhöhten SAR-Belastungen des Personals führen.In particular, in magnetic resonance devices that use high magnetic field strengths for investigation, the stray field effect could lead to malfunction of the equipment and to increased SAR workload of the staff.
Es ist daher Aufgabe der vorliegenden Erfindung, schädigende Einflüsse von Streufeldern, die während der Untersuchung durch ein Magnetresonanzgerät gebildet werden, in einem räumlichen Bereich zu verringern.It is therefore an object of the present invention to reduce the harmful effects of stray fields, which are formed during the examination by a magnetic resonance apparatus, in a spatial area.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.This object is solved by the features of patent claim 1. Advantageous developments are specified in the subclaims.
Bei der erfindungsgemäßen Anordnung zur Abschirmung ist einIn the arrangement according to the invention for shielding is a
Magnetresonanzgerät, das im Betrieb ein hochfrequentes Streufeld aussendet, in einem räumlichen Bereich angeordnet. Der räumliche Bereich weist eine Anordnung auf, die zum absorbieren des hochfrequenten Streufelds ausgebildet ist.Magnetic resonance device that emits a high-frequency stray field during operation, arranged in a spatial area. Of the Spatial region has an arrangement which is designed to absorb the high-frequency stray field.
Durch die vorliegende Erfindung wird erreicht, dass Personal und gegebenenfalls benötigtes Gerät innerhalb des räumlichen Bereichs auch während der Untersuchung verbleiben kann.By means of the present invention, it is achieved that personnel and possibly required equipment can remain within the spatial area even during the examination.
Nachfolgend wird die Erfindung anhand einer Zeichnung näher erläutert. Dabei zeigt:The invention will be explained in more detail with reference to a drawing. Showing:
FIG 1 eine beispielhafte erste Ausgestaltung der vorliegenden1 shows an exemplary first embodiment of the present invention
Erfindung, undInvention, and
FIG 2 eine beispielhafte zweite Ausgestaltung der vorliegenden Erfindung.2 shows an exemplary second embodiment of the present invention.
FIG 1 zeigt eine beispielhafte erste Ausgestaltung der vorliegenden Erfindung.1 shows an exemplary first embodiment of the present invention.
Ein Magnetresonanzgerät MRG, das im Betrieb ein hochfrequen- tes Streufeld SF aussendet, ist in einem räumlichen Bereich RB angeordnet.A magnetic resonance device MRG, which emits a high-frequency stray field SF during operation, is arranged in a spatial region RB.
Beispielsweise ist der räumliche Bereich RB ein Untersuchungsraum oder ein Schirmkabine der eingangs beschriebenen Art.For example, the spatial area RB is an examination room or a screen cabin of the type described above.
Der räumliche Bereich RB weist eine Anordnung KS bzw. K auf, die zum absorbieren des hochfrequenten Streufelds SF ausgebildet ist.The spatial area RB has an arrangement KS or K, which is designed to absorb the high-frequency stray field SF.
Die absorbierende Anordnung K bzw. KS umfasst beispielsweise ein elektrisch leitendes, reflexionsarmes, dämpfendes Material, das bevorzugt Kohlenstoff enthält.The absorbent assembly K or KS comprises, for example, an electrically conductive, low-reflection, damping material, which preferably contains carbon.
Zur Absorption des Streufelds SF zum Boden bzw. zur Decke hin wird beispielsweise ein mattenförmig ausgestaltetes absorbierendes Material KS verwendet. Zur Absorption des Streufelds SF zu den umgebenden Wänden hin wird beispielhaft zusätzlich das absorbierende Material kegelförmig oder pyramidenförmig oder entsprechend vergleichbar ausgeformt und an den Wänden angeordnet - hier als ausgeform- tes Material KS bezeichnet.For absorption of the stray field SF to the bottom or to the ceiling, for example, a mat-shaped configured absorbent material KS is used. In order to absorb the stray field SF toward the surrounding walls, the absorbent material, for example, is additionally shaped conically or pyramidally or in a comparable manner and arranged on the walls - here referred to as a molded material KS.
Weitere Ausformungen des Materials KS wären beispielsweise (in nicht ausschließlicher Aufzählung) kegelstumpf-, pyramidenstumpf-, zylinder-, kugelförmig oder jeweilige Mischformen daraus.Further embodiments of the material KS would be, for example (in non-exclusive list) truncated cone, truncated pyramid, cylindrical, spherical or respective mixed forms thereof.
Die Kegelform, Pyramidenform usw. ist derart dimensioniert, dass aufgrund der Geometrie eine Absorption des Streufelds erfolgt .The conical shape, pyramid shape, etc. is dimensioned such that due to the geometry of an absorption of the stray field.
Die Dimensionierung erfolgt beispielsweise abgestimmt auf die Betriebsfrequenz des Magnetresonanzgeräts, die über die Body- coil-Antennenanordnung typischerweise das Streufeld bildet.The dimensioning is done, for example, matched to the operating frequency of the magnetic resonance device, which typically forms the stray field via the body coil antenna arrangement.
Es ist auch möglich, die mattenförmige bzw. die kegelförmige Ausgestaltung des Materials ausschließlich einzeln zu verwenden oder beide Ausgestaltungen beliebig miteinander zu kombinieren - hier nicht näher dargestellt.It is also possible to use the mat-shaped or conical configuration of the material exclusively individually or to combine both configurations as desired with one another - not shown here in detail.
In einer vorteilhaften Weiterbildung ist die Kegelstruktur bzw. die Mattenstruktur zum zusätzlichen absorbieren von Schallwellen dimensioniert.In an advantageous development, the cone structure or the mat structure is dimensioned for additional absorption of sound waves.
Dadurch wird vorteilhaft erreicht, dass die Schallbelastung des Patienten und des Personals während der erfolgenden Mag- netresonanzuntersuchung reduziert wird.As a result, it is advantageously achieved that the sound load of the patient and of the personnel during the magnetic resonance examination taking place is reduced.
Das absorbierende Material kleidet den räumlichen Bereich zumindest teilweise aus, bevorzugt ist der ganze Raum mit dem absorbierenden Material flächig ausgestattet. FIG 2 zeigt eine beispielhafte zweite Ausgestaltung der vorliegenden Erfindung.The absorbent material at least partially covers the spatial area, preferably the entire space is provided with the absorbent material in a planar manner. 2 shows an exemplary second embodiment of the present invention.
Eine absorbierende Anordnung KA umfasst hier frequenzselekti- ve Resonanzkreise RK, die zum absorbieren des hochfrequenten Streufelds SF dimensioniert sind. Zur Dimensionierung wird beispielsweise wieder die oben genannte Betriebsfrequenz verwendet .An absorbing arrangement KA here comprises frequency-selective resonant circuits RK, which are dimensioned to absorb the high-frequency stray field SF. For dimensioning, for example, the above-mentioned operating frequency is used again.
Zur Verstärkung der absorbierenden Wirkung kann neben den Resonanzkreisen RK zusätzlich das oben beschriebene absorbierende Material KS verwendet werden.To enhance the absorbing effect, in addition to the resonant circuits RK, the above-described absorbent material KS can additionally be used.
Die frequenzselektiven Resonanzkreise RK sind beispielsweise ähnlich wie bei RFID-Komponenten ausgestaltet, die bei derThe frequency-selective resonant circuits RK are configured, for example, similar to RFID components that are used in the
Betriebsfrequenz jeweilige Streufeldkomponenten auf Masse ableiten . Operating frequency derived stray field components to ground.

Claims

Patentansprüche claims
1. Anordnung zur Abschirmung,1. Arrangement for shielding,
- bei dem ein Magnetresonanzgerät, das im Betrieb ein hochfrequentes Streufeld aussendet, in einem räumlichen- In which a magnetic resonance device that emits a high-frequency stray field in operation, in a spatial
Bereich angeordnet ist, dadurch gekennzeichnet,Area is arranged, characterized
- dass der räumliche Bereich eine Anordnung aufweist, die zum absorbieren eines hochfrequenten Streufelds ausge- bildet ist.- That the spatial area has an arrangement that is designed to absorb a high-frequency stray field.
2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die absorbierende Anordnung ein elektrisch leitendes, reflexionsarmes, dämpfendes Material umfasst.2. Arrangement according to claim 1, characterized in that the absorbent assembly comprises an electrically conductive, low-reflection, damping material.
3. Anordnung nach Anspruch 2, dadurch gekennzeichnet, dass das absorbierende Material kohlenstoffhaltig ist.3. Arrangement according to claim 2, characterized in that the absorbent material is carbonaceous.
4. Anordnung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das absorbierende Material eine Kegelstruktur aufweist und die Kegelform zum absorbieren des Streufelds dimensioniert ist.4. Arrangement according to claim 2 or 3, characterized in that the absorbent material has a conical structure and the conical shape is dimensioned for absorbing the stray field.
5. Anordnung nach Anspruch 4, dadurch gekennzeichnet, dass die Kegelstruktur zum zusätzlichen absorbieren von Schallwellen dimensioniert ist.5. Arrangement according to claim 4, characterized in that the cone structure is dimensioned for additional absorption of sound waves.
6. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Anordnung frequenzselektive Resonanzkreise umfasst, die zum absorbieren des hochfrequenten Streufelds dimensioniert sind.6. Arrangement according to claim 1, characterized in that the arrangement comprises frequency-selective resonant circuits, which are dimensioned to absorb the high-frequency stray field.
7. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Anordnung zur Absorption auf eine Betriebsfrequenz des Magnetresonanzgeräts abgestimmt ist, die über die Bodycoil-Antennenanordnung das Streufeld bildet. 7. Arrangement according to one of the preceding claims, characterized in that the arrangement is tuned for absorption to an operating frequency of the magnetic resonance apparatus, which forms the stray field via the body coil antenna arrangement.
8. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Anordnung den räumlichen Bereich zumindest teilweise auskleidet.8. Arrangement according to one of the preceding claims, characterized in that the arrangement at least partially lines the spatial area.
9. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Anordnung zum zusätzlichen absorbieren von Schallwellen dimensioniert ist.9. Arrangement according to one of the preceding claims, characterized in that the arrangement for the additional absorbing of sound waves is dimensioned.
10. Anordnung nach einem der vorhergehenden Ansprüche, da- durch gekennzeichnet, dass der Bereich während des Betriebs für Betreuungspersonal zugänglich ist und/oder dass innerhalb des Bereichs weitere medizinische Geräte in Betrieb sind. 10. Arrangement according to one of the preceding claims, character- ized in that the area is accessible during operation for care personnel and / or that within the area further medical devices are in operation.
PCT/EP2008/053988 2007-04-13 2008-04-03 Arrangement for shielding WO2008125505A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710017533 DE102007017533A1 (en) 2007-04-13 2007-04-13 Arrangement for shielding
DE102007017533.9 2007-04-13

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WO2008125505A1 true WO2008125505A1 (en) 2008-10-23

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01102999A (en) * 1987-10-16 1989-04-20 Hitachi Medical Corp Electromagnetic wave shield room for nuclear magnetic resonance imaging equipment
GB2360094A (en) * 2000-03-06 2001-09-12 Marconi Caswell Ltd RF screens for MRI
US20010024121A1 (en) * 2000-03-27 2001-09-27 Tdk Corporation Electromagnetic wave absorber
US20030016518A1 (en) * 2001-07-16 2003-01-23 Winfried Arz Shielded compartment for a magnetic resonance apparatus
WO2005043181A1 (en) * 2003-10-29 2005-05-12 Koninklijke Philips Electronics N.V. Shielded treatment room and device suitable for recording images on the basis of magnetic resonance

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1261912B (en) * 1962-03-29 1968-02-29 Siemens Ag Box-shaped, shielded measuring room for measuring electromagnetic or acoustic waves
DE3131137C2 (en) * 1981-08-06 1985-10-03 Dieter Dipl.-Ing. Busch Device for shielding and absorbing electromagnetic fields

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01102999A (en) * 1987-10-16 1989-04-20 Hitachi Medical Corp Electromagnetic wave shield room for nuclear magnetic resonance imaging equipment
GB2360094A (en) * 2000-03-06 2001-09-12 Marconi Caswell Ltd RF screens for MRI
US20010024121A1 (en) * 2000-03-27 2001-09-27 Tdk Corporation Electromagnetic wave absorber
US20030016518A1 (en) * 2001-07-16 2003-01-23 Winfried Arz Shielded compartment for a magnetic resonance apparatus
WO2005043181A1 (en) * 2003-10-29 2005-05-12 Koninklijke Philips Electronics N.V. Shielded treatment room and device suitable for recording images on the basis of magnetic resonance

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